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NEW DISTRIBUTIONAL RECORDS of GREAT PLAINS PSEUDO SCORPIONS (ARACHNIDA: PSEUDOSCORPIONES) Paul O

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NEW DISTRIBUTIONAL RECORDS of GREAT PLAINS PSEUDO SCORPIONS (ARACHNIDA: PSEUDOSCORPIONES) Paul O University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Great Plains Research: A Journal of Natural and Great Plains Studies, Center for Social Sciences Fall 2012 NEW DISTRIBUTIONAL RECORDS OF GREAT PLAINS PSEUDO SCORPIONS (ARACHNIDA: PSEUDOSCORPIONES) Paul O. Cooney Redford, MI, [email protected] James A. Kalisch University of Nebraska - Lincoln, [email protected] Follow this and additional works at: http://digitalcommons.unl.edu/greatplainsresearch Part of the American Studies Commons, Entomology Commons, and the Geography Commons Cooney, Paul O. and Kalisch, James A., "NEW DISTRIBUTIONAL RECORDS OF GREAT PLAINS PSEUDO SCORPIONS (ARACHNIDA: PSEUDOSCORPIONES)" (2012). Great Plains Research: A Journal of Natural and Social Sciences. 1232. http://digitalcommons.unl.edu/greatplainsresearch/1232 This Article is brought to you for free and open access by the Great Plains Studies, Center for at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Great Plains Research: A Journal of Natural and Social Sciences by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Great Plains Research 22 (Fall 2012):195-201 © 2012 Copyright by the Center for Great Plains Studies, University of Nebraska-Lincoln NEW DISTRIBUTIONAL RECORDS OF GREAT PLAINS PSEUDO SCORPIONS (ARACHNIDA: PSEUDOSCORPIONES) PaulO. Cooney 16351 Glenmore Redford, MI48240 Pa3c456@ao/.com and James A. KaUsch Department ofEntomology 202 Entomology Hall University ofNebraska-Lincoln Lincoln, NE 68583-0816 [email protected] ABSTRACT-Pseudoscorpions are tiny, oval, brown, flattened arachnids that possess large "pinchers" in front of the body for capturing smaller prey. They generally live in forested habitats in soil litter or beneath loose bark. It has been presumed that pseudoscorpions are scarce in the Great Plains, except for along rivers, due to harsh climatic conditions. However, new records of pseudo scorpions from the Great Plains were derived from identification of specimens obtained from university and college collections, and from specimens collected by the first author. Records provided new revelations about distributions of not only the more commonly known pseudoscorpion species but also species previously not believed to be adaptable to grassland habitats. For ex­ ample, Dactylochelifer silvestris Hoff, a western species, appears to be common throughout the Great Plains, with new state records from Kansas, Montana, Nebraska, North Dakota, Oklahoma, South Dakota, Texas and Wyoming. In addition, Parachernes nubilis (Hoff) previously was not known from Kansas, Nebraska, or Texas, and Parachernes virginicus Hoff, Apocheiridium stannardi Hoff, Hysterochelifer proprius Hoff, and Chthonius tetrachelatus (Preyssler) are newly recorded for Nebraska. Records of Microbisium parvulum from Rapp (1978) in Nebraska were bolstered by five more in the state. Key Words: pseudoscorpion, false scorpion, arthropod records, Great Plains, grasslands, ecology, yucca, sagebrush INTRODUCTION The Great Plains is a vast grassland region generally Formerly this region consisted of immense expanses lying west of the Missouri River and east of the Rocky of tallgrass, mixed-grass, and shortgrass prairies. It now Mountains in the United States and Canada (Wishart can be described as a complex patchwork of prairies, pas­ 2004). It extends from southern Canada to the Rio Grande tures, rangeland, agricultural cropland, and mostly small along the Mexican border in Texas and is transected by rural communities interconnected with transportation rivers and streams mainly flowing eastward from the routes. Rockies (Fig. I). Altitude increases east to west from less Pseudoscorpions, also referred to as "false scorpions," than ISO m (500 ft) above sea level to more than 1,524 m are tiny, brown, flattened arthropods that possess large (5,000 ft). Topography is quite diverse, having alluvial grasping pincers in front, called palps, for seizing and and upland plains, hills, canyons, escarpments, buttes, feeding upon smaller prey (Fig. 2). Unlike a scorpion, badlands, and intrusions of much higher mountains. they have no tail, but like their spider cousins, they pro­ duce silk to line their chambers for protection during dor­ Manuscript received for review, March 2012; accepted for publication, mancy or to encase their eggs. Most species are associated July 2012. with woodland microhabitats such as soil surface litter, 195 196 Great Plains Research Vol. 22 No.2, 2012 Alberta ." Manitoba ~ .... ....... ~ . " :. .... -. Ontario : Saskatchewan -••• :. ...... .. "" " :. Montana ' ...... ". South Dakota .... Wyoming ••••• Nebraska .....--'-_...... _""-.....,j~ ......... _..J1 3 mm · · Figure 2. Pseudoscorpion (Oactylochelifer silvestris), adult Colorado ·':. male. ·· ·.. New Mexico : pseudoscorpions have not become adapted to grassland .•· conditions, with the exception that species are often found in woody debris and litter of trees along watercourses and near lakes and springs, as well as in the debris of nests of birds and rodents." However, Rapp (1978) in a preliminary study collected Microbisium parvulum Hoff from nine of28 sites in tallgrass and mixed-grass prairies in Nebraska. He postulated that moisture and depth of litter were important factors that limit pseudoscorpions in grasslands or pastures, noting also that overgrazed Figure 1. Simplified map of the Great Plains, showing native pastures in particular are almost devoid of arthro­ boundaries. pods living in soil and litter, including pseudoscorpions. In conclusion, this earlier literature cited suggests that loose bark of trees, rotted logs, rock crevices, beneath pseudoscorpions are less abundant in the prairies presum­ stones, and bird and rodent nests. They prefer moist, or­ ably because of limited microhabitats (litter) and harsh ganic habitats in which other small invertebrates thrive. climatic conditions, primarily due to the drying action In their feeding habits, pseudoscorpions are limited to of the wind and the sun. We report results of our studies smaller prey, such as tiny insect larvae, springtails, mites, to test this idea and to better understand distributions of ants, booklice, small worms, and other soft-bodied micro­ pseudoscorpion species in the Great Plains. invertebrates. They are limited in their ability to disperse, but many pseudoscorpions hitchhike great distances by MATERIALS AND METHODS grasping onto beetles, flies, and moths (Weygoldt 1969; Muchmore 1990; Beccaloni 2009). Many new records of pseudo scorpions from the Biologists do not know much about pseudoscorpions Great Plains were derived from our study of specimens in the Great Plains. Pseudoscorpions frequently have obtained by request from university and college col­ been associated with deciduous forest regions (Nelson lections, with corresponding abbreviations, as follows: 1975). Hoff and Bolsterli (1956) reported several spe­ Chadron State College (CSCC), Colorado State Univer­ cies from deciduous forests along the major streams that sity (CSUC), University of Kansas Snow Entomological transect the Great Plains but did not expect that there Museum (SEM), University of Minnesota (UMSP), would be any in grasslands, due to inhospitable climatic University of Nebraska State Museum (UNSM), Uni­ conditions. Hoff (1959) also made reference to the eastern versity of New Mexico Museum of Southwestern Biol­ two-fifths of Colorado, which lies in the Great Plains, as ogy (UNM), North Dakota State University (NDSU), an area "occupied by a grassland community, but where Oklahoma State University (OSEC), South Dakota State © 2012 Center for Great Plains Studies, University of Nebraska-lincoln New Distributional Records of Great Plains Pseudoscorpions • PaulO. Cooney and James A. Kalisch 197 University (SDSU), and West Texas State University (WTSU). These pseudo scorpions largely came from student collections in field biology courses or as incidental speci­ mens collected during field research projects involving evaluation of other arthropods in soil and litter in spe­ cific types of prairie grassland, such as the tallgrass or short grass prairie biomes. These specimens were mainly obtained either by extraction from grass or associated soil using a metal funnel and light apparatus called a Berlese funnel or by collection from pitfall traps inserted in the ground. The remainder of the new records came from pseudo­ scorpions collected by the senior author at 21 sites while traveling several times across parts of the Great Plains Figure 3. Sagebrush (Artemisia tridentata), habitat for pseudoscorpions. from 1999 to 2009. Sites selected for investigation were those thought to offer protective microhabitats favoring CHTHONIIDAE: pseudoscorpions and other tiny invertebrates on which Chthonius tetrachelatus (Preyssler) they feed. This included litter from bases of yucca plants and sagebrush (Fig. 3), dense tussocks of bunchgrasses, *Nebraska tree bark and organic debris below trees, leaf litter, and - Dawes Co., Brigg's Pond, Berlese funnel, objects on the ground. Leaf detritus and rotting yuccas twigs and leaves, 17-IX-04, H.R. Lawson. were pulled apart and sifted through a 4.0 mm mesh (UNSM) screen over a white enameled pan. Tree bark was pulled from dead trees or stumps and gently struck against the CHERNETIDAE: inside edge of the pan to dislodge arthropods clinging Microbisium parvulum Hoff to the bark, and the surfaces of trunks or stumps were carefully examined for specimens. Material collected
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